ftrace: Have calltime be saved in the fgraph storage

The calltime field in the shadow stack frame is only used by the function
graph tracer and profiler. But now that there's other users of the function
graph infrastructure, this adds overhead and wastes space on the shadow
stack. Move the calltime to the fgraph data storage, where the function
graph and profiler entry functions will save it in its own graph storage and
retrieve it in its exit functions.

Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <olsajiri@gmail.com>
Link: https://lore.kernel.org/20240914214827.096968730@goodmis.org
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

This commit is contained in:

Steven Rostedt

2024-09-14 17:48:08 -04:00

committed by

Steven Rostedt (Google)

parent 3c9880f3ab

commit f1f36e22be

4 changed files with 51 additions and 34 deletions

									
										include/linux/ftrace.h
									
		-1
	
												View File
												
				@@ -1091,7 +1091,6 @@ void *fgraph_retrieve_parent_data(int idx, int *size_bytes, int depth);

				struct ftrace_ret_stack {

					unsigned long ret;

					unsigned long func;

					unsigned long long calltime;

				#ifdef HAVE_FUNCTION_GRAPH_FP_TEST

					unsigned long fp;

				#endif